class Car:
    """一次模拟汽车的简单尝试"""
    def __init__(self,make,model,year):
        self.make = make
        self.model = model
        self.year = year
        self.odometer = 0

    def get_describe_name(self):
        long_name = f"{self.year} {self.make} {self.model}"
        return long_name.title()

    def read_odometer(self):
        print(f"This car has {self.odometer} miles on it")

    def update_odometer(self,miles):
        if miles > self.odometer:
            self.odometer = miles
        else:
            print(f"您修改的里程数必须超过{self.odometer} miles")

    def increment_odometer(self,miles):
        self.odometer += miles


class Battery:
    """一次模拟电动汽车电瓶的尝试"""
    def __init__(self, battery_size=75):
        self.battery_size = battery_size

    def describe_battery(self):
        print(f"This cas has a {self.battery_size}-kwh battery")

    def get_range(self):
        """打印一条消息,指出电瓶的续航里程"""
        if self.battery_size == 75:
            range = 260
        elif self.battery_size == 100:
            range = 315

        print(f"This car can go about {range} miles on a full charge.")

    def upgrade_battery(self):
        if self.battery_size == 75:
            self.battery_size =100


class ElectricCar(Car):
    """电动汽车的独特之处"""
    def __init__(self,make,model,year):
        """初始化父类属性"""
        super().__init__(make,model,year)
        self.battery = Battery()


my_tesla = ElectricCar('telsa',"model s",'2019')
print(my_tesla.get_describe_name())

my_tesla.battery.describe_battery()
my_tesla.battery.get_range()

my_tesla.battery.upgrade_battery()
my_tesla.battery.describe_battery()
my_tesla.battery.get_range()